Dead stop



' Feb.`3, 1970 DL w. LASIER & 5

V I 'DEAD STOP Filed April 8, 1968 3 Sheets-Sheet l W//Ji////M //////////////W% ZZZ/enfir. Jaw d Zfaxjen Feb. 3, 1970 D. w. LASIER & 5

i DEAD STOP l Filed April a, 1968 &shats-sheet 2 D. W. LASIER Feb.`3, 1970 DEAD 'STOP 3 Sheets-Sh'eet 3 Filed April 8. 1968 U.S. Cl. 16-49 United States Patent O 3,492,686 DEAD STOP David W. Lasier, Princeton, Ill., assignor to Schlage Lock Company, San Francisco, Calif., a corporation of California Filed Apr. 8, 1968, Ser. No. 719,515 Int. Cl. Ef 3/00; E05d 11/00, 11/06 Claims ABSTRACT OF THE DISCLOSURE A door stop member for limiting door opening by restricting the opening of the arms of a door control system to a preselected maximum angle. The door stop member is retained solely by the pivotalconnecting means between the ends of the two arms, and no additional securing means are required. When the arms have opened to the desired maximum angle, a first projecting stop portion engages one of the arms and a second projecting stop portion engages the second arm. The two stop portions are on opposite sides of the pivotal connecting means.

The present invention pertains to door control systems with dead stop and more particularly to a dead stop member which may be readily inserted at the connecting point between the two arms of a door control system to provide the desired dead stop function.

The present invention provides asimple and inexpensive dead stop member which may be readily installed in a wide variety of either new or existing door control systems to provide an effective dead stop restricting the door opening to any desired preselected maximum angle. The dead stop member of the invention does not require a rigid connection to the door control system or its structual modification. This is in contrast to dead stop arrangements as shown in the Sheridan Patent No. 3,259,936 or various prior dead stop arrangements utilizing specially constructed arms or joints therebetween. The dead stop member of the invention does not interfere in any way With the door control systems normal operation, except in its provision of a dead stop angle.

The dead stop member of the invention has a central portion which provides for the securing of the stop member solely by the pivotal connecting means interconnecting the ends of the folding arms in the door control system. First and second stop portions project oppostely spaced from this central portion. The first stop portion obstructively engages one of the arms and the second stop portion obstructively engages the other arm only when the arms are open to the preselected maximum angle which is determined by the preselected angular relationship of the three principal Components of the stop member, i.e. the first stop portion, the central securing portion and the second stop portion.

Further objects, features and advantages of the invention pertain to the particular arrangement and structure whereby the above mentioned aspects of the invention are attained. The invention will be better understood by reference to the following description and to the drawings forming a part thereof, which are substantially to scale, wherein:

FIG. 1 is a top plan View of an exemplary door control system in accordance with the invention showing a left-hand door opening application with the door open to the dead stop position;

FIG. 2 shows the door control system of FIG.'l with the door closed; v

FIG. 3 is the same system illustrated in FIG. 1 showing a right-hand door application with the door closed;

FIG. 4 is an exploded view showing the arms and the dead stop member of FIG. 1;

3,492,686 Patented Feb. 3, 1970 FIG. S is a partial side elevational View taken along the line 5-5 of FIG. 1; and

FIGS. 6 through 10 illustrate individual alternative embodiments for the dead stop member shown in FIGS. 1 through 5.

Referring to the drawings, there is shown in FIGS. 1 through 5 an exemplary door control system 20 incorporating the present invention. In FIGS. 6 through 10, there are shown further exemplary dead stop members which may be utilized in the door control system 20 or other door control systems. While the door control system 20 illustrates a conventional door closer mechanism 22, it will be appreciated that the invention is not limited thereto and may be incorporated in any door control system having a pair of pivotally connected folding arms, with or without a door closer mechanism. However, as an important advantage, the present invention provides a dead stop member which may be readily utilized with either new or already installed conventional door closer mechanisms to readily provide a dead stopping function thereto.

The stop member 24 shown in FIGS. 1 through 5 is shown separately in FIG. 4 which also shows the manner in which the member is readily assembled into the door control system 20. The interrelation of the stop member 24 and the door control system 20 in dead stopping is best s own in FIGS. 1 and S. The stop member 24 is preferably a single elongate unitary member which may be inexpensively made by stamping and formng a plate of sheet metal. The member should be of sufficient thickness to provide overall rigidity.

The principal portion of the stop member 24 comprises a central portion 26. The central portion 26 is coplanar with and lies in between the outer ends of the main arm 28 and the forearm 30 of the door control system 20. The entire stop member 24 is preferably a small generally elongate member substantially smaller in dimensions than either of the arms 28 or 30.

The central portion 26 of the stop member 24 preferably has a centrally located'aperture 32 therethrough. The aperture 32 preferably provides the sole means for the securing of the stop member 24 to the door control system 20, i.e. no other rivets or securing means are required and the stop member 24 is not fastened to either of the two arms. The aperture 32 is preferably sufficiently large to allow the regular pivotal connecting means interconnecting the ends of the two arms to pass therethrough. Thus, the stop member 24 is secured from lateral movement, but is free to rotate about the pivotal connecting means. The pivotal connecting means illustrated herein comprises a bolt 34 and nut 36; however, it Will be appreciated that riveting or other suitable pivotal connecting means may be provided.

The stop member 24 further includes a projecting first stop portion 38 and a projecting second stop portion 40. Referring particularly to FIGS. 4 and 5, it may be seen that the first stop portion 38 projects upwardly into the path of opening movement of the forearm 30 and that the second stop p-ortion 40 projects downwardly into the path of opening movement of the main arm 28. The first stop portion 38 here comprises an ear at one edge of the stop member 24 projecting perpendicularly from the central portion 26 in one direction, while the second stop portion comprises another ear projecting from the central portion 26 in the opposite perpendicular direction. It may be seen that the first and second stop portions are located substantially at opposite ends of the stop member 24. Both stop portions are spaced a substantial distance from the aperture 32 in opposite directions therefrom. There is a preselected angular relationship between the first stop portion 38, the aperture 32 and the second stop portion 40, which defines a preselected dead stop angle between the forearm and main arm of the door control system.

As the pair of arms 28 and 30 opens during the door opening, there is normally no interfe'ence whatsoever in the normal door opening operation by the stop member 24. The engagement of only one of the first or second stop portions 38 and 40 against one of the arms will not provide any restriction thereof as the stop member 24 is free to rotate about the bolt 34. Only when the desired maximum opening angle between the two arms 28 and 30 is reached is a restricton provided. At that point, as shown in FIG. 1, there is a simultaneous engagement of the first stop portion 38 with the foream 30 and the second stop portion 40 with the main arm 28. Thus, at this angle between the arms, the stop member 24 prevents any further angular opening between the two arms by means of the lateral force exerted on the arms at the first and second stop portions and by means of the lateral restriction provided by the bolt 34 on the stop member 24. The stop portions obstructively engage the outer sides of the arms at this angle even through there is no actual connection of the stop member to either of the arms.

It will be observed that the stop member 24 shown in FIGS. 1 through includes additional stopportions 42 and 44 located adjacent the stop portions 38 and 40 respectively, but projecting in opposite directions therefrom. The stop portions 42 and 44 allow the stop member 24 to be installed with either side upward, i.e. no matter which Way the workman installs the stop member 24 it will operate properly. This feature is also provided in the embodiment of FIG. 9.

As may be readily seen from a comparison of FIGS. 2 and 3, the same stop members disclosed herein may be utilized in either a right-hand or left-hand door control system application. The installation and ope ation are the same.

FIGS. 6 through illustrate further exemplary embodiments of stop members which may be utilized in accordance with the present invention. The stop members illustrated therein are directly substitutable for the stop member 24 in the door control system 20 of FIGS. 1 through 5 or other door control systems. The principle of operation is the same.

The apparatus described herein provides a simple, readily installed, inexpensive, yet effective door stop function for many door control systems. While the apparatus described herein is presently considered to be preferred, it will be understood that numerous variations and modifications may be made therein by those skilled in the art and it is intended that all such variations and modifications as fall within the true spirit and scope of the invention.

What is claimed is:

1. In a door control system having a pair of elongate door controlling folding arms, each pivotally connected to the other at one end by pivtal connecting means, where said arms open with respect to one another about said pivotal connecting means as the door opens, the improvement comprising:

a door stop member for limiting door opening by limiting the maximum opening of said arms,

said door stop member having a central portion with means therein for retention of said door stop member by said pivotal connecting means,

said door stop member being Secured solely to said pivotal connecting means,

a first stop portion projecting from said central portion of said stop member and spaced from said means for retention,

a second stop portion projecting from said central portion of said stop member and spaced from said means for retention oppositely of said first stop portion,

said first stop portion, said means for retention and 3. The apparatus of claim 1 wherein said door stop member is removably pivotally retained by said pivotal connecting means and is pivotable with respect to both of said pair of arms.

4. The apparatus of claim 1 wherein said door stop member is a unitary Component readily removable solely by the removal of said pivotal connecting, means.

5. The apparatus of claim wherein said first stop portion projects perpendicularly in one direction from said central portion and said second stop portion projects perpendicularly in the opposite direction from said central portion.

6. The apparatus of claim 1 wherein said door stop member has an elongate configuration and said first and second stop portions are located at opposite ends thereof.

7. The apparatus of claim 1 wherein said door stop member contains at least two additional stop portions projecting oppositely from said first rand second stop portions.

8. The apparatus of claim 1 wherein said means for retention comprises an aperture through said central portion adapted to receive said pivotal connecting means therethrough, and wherein said door stop member has an elongate configuration and said first and second stop portions are located at opposite ends thereof.

9. The apparatus of claim 1 wherein said means for retention comprises an aperture through said central portion adapted to receive said pivotal connecting means therethrough,

wherein said door stop member is removably pivotally retained by said pivotal connecting means and is pivotable with respect to both of said pair of arms, and

wherein said first stop portion projects perpendicularly in one direction from said central portion and said second stop portion projects perpendicularly in the o posite direction from said central portion.

10. The apparatus of claim 1 wherein said means for retention comprises an aperture through said central portion adapted to receive said pivotal connecting means therethrough,

wherein said door stop member is a unitary component removably pivotally retained solely by said pivotal connecting means and is pivotable with respect to both of said pair of arms,

wherein said first stop portion projects perpendicularly in one direction from said central portion and said second stop portion projects perpendicularly in the opposite direction from said central portion, and

wherein said door stop member has an elongate configuration and said first and second stop portions are located at opposite ends thereof.

References Cited UNITED STATES PATENTS 1,133,454 3/1915 Banzett 16-143 1,586,245 5/ 1926 Hurd 16-49 3,178,762 4/1965 Whitng 16--191 CASMIR A. NUNBERG, Primary `Examiner U.S. CI. X.R. 16 l37, 191

m g-; UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION patent 3,492,686 Dated February 3, 1970 Inventor(s) David W. Lasier It is Certified that: error appears in the &bave-identified patent and that: said Letters Patent are hereby corrected as shown below:

column 4, claim 5, line l, after "claim" insert --l-F JUL141970 a'- B HE v a,

Anaa::

EdwdMFietcher Jr ?mm R- v fl m ssiom of. Patents Attesting officer 

